In Kindle and Nook and other e-readers, is the collection held in a cloud somewhere?

On Kindle Paperwhite. Amazon offers free cloud storage. So all your books are safe whenever you need them again to download.

No you cant access B&N.

Yes B&N is pretty unstable and it just let go its tablet by disowning them.

I also suggest you take a look at this review on Kindle vs Nook - Detailed comparison:

http://www.amazon.com/review/RG63YHMKKC3W5/?_encod...

You are welcome!

Your answer is yes and yes. I can't speak for the Nook, but it probably does work like the Kindle. WHen you purchase a title from Amazon, you "own" that title. You can put in on your Kindle or on another device and access it with a Kindle reading app (free). Once you put it on your Kindle, it is resident in your device, just like any file on a hard drive. If you remove it from your Kindle, Amazon has a record of your purchase and you can reload it onto your Kindle at any time from the cloud.

I'm not sure about the compatibility between the two devices - I know they use differing file formats, but there are many file format conversion programs that can convert files of one type to another. So you won't be able to access B&N purchased items or put them directly onto a new Kindle. I believe the primary file type for most non-Kindle devices is epub, while the Kindle standard format is mobi. I have an epub to mobi converter and haven't had any problems converting and reading epub files on my Kindle.

If you lose your Kindle or buy a new one, you can re-download anything you have already purchased from Amazon to your new device, once you have registered it and linked it to your account.

kindle: The ebooks go into an account on Amazon. Then, you download the ebooks to your device, which can be a kindle, a smartphone with the kindle app, or a computer with the kindle program. The items are also held in your account with Amazon so you can always retrieve them if you have removed them from a device & want to see them later. Yes, you can put ebooks on a new kindle once you link it to your account.

I don't think you can access B&N books from a kindle, and with the news from B&N I'd go with a kindle or some other reader if I were buying a new one now.

Sort of. Both Amazon and B&N have records of your purchases. If you deregister (you can do this on the device or on the company's website) your device and register a new one, all of your purchases will be available for download.

Get a Kindle. Stay away from the Nook.

For Amazon Kindle, all your ebooks are stored in the cloud (on Amazon servers)

You can access your Kindle library here: https://www.amazon.com/gp/digital/fiona/manage?ie=...

For B&N Nook HD, you can permanently delete ebook, periodical, or app forever. However, you can also 'Move to NOOK Cloud' to keep copy of your content in your account in the NOOK Cloud and re-download anytime

See Q7 in 'Library' http://www.barnesandnoble.com/u/support-nook-hd/37...

You can access B&N content on Amazon Kindle and vice versa, by just logging into your account and downloading content

There are reports that B&N is planning to Exit Nook tablet production

http://www.bloomberg.com/video/barnes-noble-to-exi...

http://www.latimes.com/business/technology/la-fi-t...

http://www.digitalbookworld.com/2013/barnes-noble-...

Therefore, it's best to forego Nook and go Amazon Kindle

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Cada vez que quiero comprar un Kindle lo compro aquí, siempre están perfectos para regalar, yo ya tengo el mío de Amazon, con un excelente precio el Kindle que compre para mi amiga es muy bonito, muy ligero, con páginas blancas para verlas mejor, al final ha sido otro excelente regalo por un buen precio.